Governor for speed-indicators.



A. GROSSMANN. GOVERNOR FOR SPEED INDICATORS. APPLICATION TILED 117KB 27,1908.

941,516. Patented Nov. 30, 1909.

4 Mam? rassnzarwz ALEXANDER eaossivmlvlv, or DRESDEN, GERMANY.

GOVERNOR FOR SPEED-INDICATORS.

Specification of Letters Patent.

Patented Nov. 30, 1909.

Application filed June 27', 1908. Serial No. 440,653.

To all whom it may concern:

Be it known that I, ALEXANDER Gross- MANN, residing in the GermanEmpire, in the Kingdom of Saxony, Dresden, Germany, 26Chemnitzerstrasse, have invented certain new and useful Improvements inor Relating to Governors for Speed-Indicators.

This invention relates to speed-indicators for vehicles moreparticularly to speedindicators the driven parts of which are atintervals of time uncoupled from the driving parts and braked.

The invention consists in providing means for mechanically actuating theuncoupling and brake mechanism from the driving shaft without the use ofclockwork, instead of as hereto-fore by means of clockwork which effectsthe uncoupling mechanically or by closing an electric circuit. Theworking of clockwork is deleteriously affected when the uncoupling ismechanically performed, and electromagnetic actuating means, thoughotherwise very advantageous, have the disadvantage that the vehicle mustcarry a source of electromotive force.

The present invention obviates these disadvantages and according theretothe uniform rotation of the shaft which effects the uncoupling isproduced by means of the non-uniformly rotating main shaft oraxle wit-l1the aid of a self-braking centrifugal governor so connected to thedriving friction clutch that it is adapted to retard the drivenclutch-member relatively to the driving member.

A construction embodying the invention is shown in the annexed drawing,in which Figure 1 is an elevation of the apparatus, partly in section,and Fig. 2 a section of the governor, Fig. 3 is a detail view seen fromthe right of Fig. 1 and Fig. 4 is a horizontal sectional view on lineA-B of Fig. 3.

The shaft 4 connects the apparatus to the axle of the vehicle. The shaft3 is driven by the shaft 4 and worm 2 to operate the pointer of thespeed-indicator. The shaft 30 actuates a device for uncoupling thepointer.

The end of the shaft 4 has a recess 1 serving as a bearing for thejournal 5 of a stepped cylindrical extension 6. Spring actuated pins 8entering holes in the shaft 4 cause the extension 6 to rotate with saidshaft 4. Since the protruding ends of the pins and the correspondingabutment surfaces in the extension 6 are straight on one side butbeveled on the other, the shaft 4 only rotates the part 6 in onedirection. Against the flange 10 of the extension 6 abuts a disk 11 ofleather or the like. On the boss 12 of the extension is loosely mounteda toothed wheel 13 with a long hub 14, on which there is loosely mounteda sleeve 15. The latter has a flange l6 abutting against the leatherdisk 11. The flange 10 and leather disk on the one hand, and the flange16 on the other hand, form respectively the driving and driven elementsof a friction clutch. The flange 16 is supported at the rear byaball-bearing 17 and cap 18. The flange 10 is continuously acted on by aspring 19 which thrusts-a disk 20 and ball-bearing 21 against saidflange 10. The sleeve 15 is enj gaged by one end of a spiral spring 22.A

toothed wheel 25 and drum 23 are fixed by an angled ring 24 to the hub14 of the toothed wheel. 13. To the drum 23 is fixed the other end ofthe spring 22, so that the latter resiliently connects the sleeve 15 tothe wheels 25 and 13. The toothed wheel 25 meshes with the pinion 26(Fig. 2) of a centrifugal governor 28 mounted on a horizontal shaft 27.The toothed wheel 13 meshes with a bevel-wheel 29 fixed to the aforesaidshaft 30.

The governor is inclosed in a casing 31 containing an adjustableabutment 32. By swinging outward, the weights 33 pull a disk 34 againstthis abutment. The latter and the disk have renewable'fricti0n-surfacesand the friction between them so retards the rotation of the weightsthat the throw of the latter is considerably reduced. This reduction ofthrow causes disk 34 to become disengaged from abutment 32 and thus thegovernor is again free to rotate. This automatic braking and starting ofthe governor causes uniform rotation of the pinion 26, toothed wheels 13and 29, and shaft 30, since when the speed tends to be come too greatthe brake effect retards flange 16 byreason of the retardation of thegovernor being transmitted by wheel 25, drum 23 and spring 22 to saidflange, thus causing it to slip, and when the speed falls down to withinthe predetermined limit the retardation of the governor and the slippingof the clutch ceases.

What I claim is 1. In a speed indicator the combination with a shaft, anon-uniformly rotating driving member, a friction clutch interposedbetween said driving member and shaft, and

.having driving and driven elements a self braking centrifugal governor,and means for resiliently gearing the driven element of the clutch tosaid governor, said governor including means whereby uniform rotation isimparted to the aforesaid shaft.

2. In a speed indicator the combination with a shaft, a non-uniformlyrotating driving member, a friction clutch comprising driving and drivenelements interposed between said driving member and shaft, meanscomprising beveled pins and beveled coacting surfaces whereby the drivenclutch element is actuated by rotation of the driving element in onedirection only, a self braking centrifugal governor, and means forresiliently gearing the driven element of the clutch to said governor,said governor including means whereby uniform rotation is imparted tothe aforesaid shaft.

3. In a speed indicator the combination with a shaft, a non-uniformlyrotating driving-member, a friction clutch and gearing interposedbetween said driving member and shaft, said clutch comprising drivingand driven elements, a self braking centrifugal governor, a sleevecarried by the driven clutch element, gearing interposed between theclutch and governor, and a spring connecting said sleeve and one elementof said gearing, said governor including means, whereby uniform rotationis imparted to the aforesaid gearing for actuating said shaft.

4:. In a speed indicator the combination with a shaft, a non-uniformlyrotating driving member, a friction clutch comprising driving and drivenelements, gearing interposed between said driving member and shaft foractuating the latter, means whereby the driven clutch element isactuated by rotation of the driving element in one direction only, aself braking centrifugal governor comprising a horizontal spindle andweights carried thereby, and means for resiliently gearing the drivenelement of the clutch to said governor spindle, said governor includingmeans whereby uniform rotation is imparted to the aforesaid gearing foractuating said shaft.

5. In a speed indicator the con'ibination with a shaft, a non-uniformlyrota-ting driving-member, a friction clutch comprising driving anddriven elements, gearing interposed between said driving member andshaft for actuating the latter, a self braking centrifugal governorcomprising a horizontal spindle and weights carried thereby, and meansfor resiliently gearing the driven clutch element to the governorspindle, said governor including meanscomprisin g a stationary frictiondisk and a movable friction disk operated by the governor weights tocoact with said stationary disk whereby uniform rotation is imparted tothe aforesaid gearing for actuating said shaft.

6. In a speed indicator the combination with a shaft, a non-uniformlyrotating driving member, a friction clutch comprising driving and drivenelements, gearing interposed between said driving member and shaft foractuating the latter, means whereby the driven cluteh element isactuated by rotation of the driving element in one direction only, aself braking centrifugal. governor comprising a horizontal spindle andweights 'arried thereby, and means for rcsiliently gearing the drivenelement of the clutch to said governor spindle, said gov ernor includingmeans comprising a normally stationary adjustable friction disk, and amovable friction disk operated by the governor weights to engage saidstationary disk for braking whereby uniform rotation is imparted by thegovernor spindle to the aforesaid gearing for actuating said shaft.

In witness whereof I have hereunto set my hand in presence of twowitnesses ALEXANDER GROSSMANN W'itnesses KARL S'rnrnn, PAUL Arms.

